Method for packaging chip

ABSTRACT

Disclosed is a method for packaging a chip, comprising the following steps: providing a baseplate formed with an open slot thereon penetrating through opposite sides of the baseplate; providing a release base material, wherein the release base material is bonded to a first side of the baseplate and covers the open slot; providing a chip, wherein the chip is mounted on the release base material at the position of the open slot; packaging a second side of the baseplate facing away from the release base material so as to form a packaging layer which packages the chip and fixes it on the baseplate; removing the release base material so as to obtain a package structure for the chip.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of International Application No. PCT/CN2019/123551, filed on Dec. 6, 2019, which claims priority to Chinese Patent Application No. 201910522476.4, filed on Jun. 17, 2019, both of which are hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of packaging, and particularly, relates to a method for packaging a chip.

BACKGROUND

With the development of electronic products toward miniaturization and thinning, manufacturers have high requirements for packaging a chip. SIP (System In a Package) packaging integrates a variety of functional chips (including processor, memory and other functional chips) into a package to realize a substantially complete function.

For example, for a packaging structure with a small bottom chip and a large top chip, after performing pressure welding on the bottom chip, a support portion is bonded to support the top chip. When packaging through injection molding or film-on-wire (FOW) process, due to the small area between the top chip and the support portion, the packaging structure often faces the problem of incomplete filling, resulting in poor reliability of packaging.

For memory products, in order to increase storage capacity and reduce package size, chip-stacked packaging is often used, where two or more chips are stacked and packaged in the thickness direction through the support portion or the FOW process. Such packaging structures are not conducive to the development of electronic products toward miniaturization and thinning.

SUMMARY

An object of the present disclosure is to provide a new technical solution for a method for packaging a chip.

According to a first aspect of the present disclosure, a method for packaging a chip is provided, which comprises the following steps:

S100: providing a baseplate formed with an open slot thereon penetrating through opposite sides of the baseplate;

S200: providing a release base material, wherein the release base material is bonded to a first side of the baseplate and covers the open slot;

S300: providing a first chip, wherein the first chip is mounted on the release base material at the position of the open slot;

S400: packaging a second side of the baseplate facing away from the release base material so as to form a packaging layer which packages the first chip and fixes it on the baseplate;

S500: removing the release base material so as to obtain a package structure for the first chip.

Optionally, a top surface of the first chip is flush with or lower than a top surface of the baseplate; and the method further comprises, after the step S400, further comprising a step of thinning the packaging layer.

Optionally, in the step S300, the first chip is mounted on the release base material in a manner in which its pins face the release base material; after the step S500, further comprising a step of performing re-distribution on the baseplate.

Optionally, the method further comprises after the step of performing re-distribution, a step of performing cutting to obtain a plurality of separate packaging structures.

Optionally, in the step S300, conducting the first chip to the baseplate through leads; and in the step S400, packaging the first chip and its leads and fixing both on the baseplate; and

after that, the method further comprising a step of mounting a second chip on the packaging layer and conducting the second chip to the baseplate through leads; and comprising a step of packaging the second chip, so as to form another packaging layer for packaging the second chip on the baseplate.

Optionally, in the step S300, a first chip is mounted on the release base material in a manner in which its pins face the release base material, a second chip is mounted on the first chip in a manner in which its pins face away from the release base material, and the pins of the second chip are conducted to the baseplate through leads;

the method further comprises in the step S400, packaging the first chip, the second chip and the leads of the second chip and fixing all on the baseplate; and

the method further comprises after the step S500, a step of conducting the pins of the first chip to the baseplate through leads, and a step of further packaging the first chip and its pins from the second side of the baseplate.

Optionally, the method further comprises a further packaging of the first chip and its leads from the second side of the baseplate through a dispensing process.

Optionally, the first chip is of the same size as the second chip.

Optionally, in the step S400, packaging is performed through an injection molding process or a film-on-wire process.

Optionally, the release base material is an adhesive tape, or a pyrolysis film, or a photolysis film, or a baseplate containing a release layer.

According to an embodiment of the present disclosure, it is possible to package the chip on the baseplate at the position of the open slot. This not only improves reliability of the package between the chip and the baseplate, but also reduces space occupied by the chip, especially the thickness of a plurality of stacked chips, thereby reducing the thickness of the entire package, which is conducive to the development of electronic products toward miniaturization and thinning.

Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in the description and constitute a part of the description, illustrate embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure.

FIG. 1a to 1f are flow charts of the packaging process of a first embodiment of the present disclosure.

FIG. 2a to 2g are flow charts of the packaging process of a second embodiment of the present disclosure.

FIG. 3a to 3g are flow charts of the packaging process of a third embodiment of the present disclosure.

DETAILED DESCRIPTION

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement, numerical expressions and numerical values of the components and steps set forth in these examples do not limit the scope of the disclosure unless otherwise specified.

The following description of at least one exemplary embodiment is in fact merely illustrative and is in no way intended as a limitation to the present disclosure and its application or use.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but where appropriate, the techniques, methods, and apparatus should be considered as part of the description.

Among all the examples shown and discussed herein, any specific value should be construed as merely illustrative and not as a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters denote similar items in the accompanying drawings, and therefore, once an item is defined in a drawing, and there is no need for further discussion in the subsequent accompanying drawings.

The present disclosure provides a method for packaging a chip, comprising the following steps: providing a baseplate formed with an open slot thereon penetrating through opposite sides of the baseplate; providing a release base material, wherein the release base material is bonded to one side of the baseplate and covers the open slot; providing a chip, wherein the chip is mounted on the release base material at the position of the open slot; packaging the other side of the baseplate facing away from the release base material so as to form a packaging layer which packages the chip and fixes it on the baseplate; removing the release base material so as to obtain a package structure for the chip.

With this packaging method, it is possible to package the chip on the baseplate at the position of the open slot. This not only improves reliability of the package between the chip and the baseplate, but also reduces space occupied by the chip, especially the thickness of a plurality of stacked chips, thereby reducing the thickness of the entire package, which is conducive to the development of electronic products toward miniaturization and thinning.

The following three packaging embodiments are taken as examples to describe the packaging process of the present disclosure in detail, and may be suitable for packaging different chips.

FIG. 1a-1f show a first embodiment of the packaging method of the present disclosure.

Referring to FIG. 1a , a baseplate having an open slot 10 a is provided. The baseplate comprises a circuit board 1 a, and is formed therein with a circuit layout for wiring. The size and shape of the open slot 10 a may be determined according to the type of the chip. The adhesive tape 2 a is bonded to one side of the circuit board 1 a and covers an opening on one side of the open slot 10 a.

Referring to FIG. 1b , a first chip 3 a is mounted on the adhesive tape 2 a at the position of the open slot 10 a, is located in the open slot 10 a, and is bonded by the adhesive layer of the adhesive tape 2 a. Wherein, the height of the first chip 3 a has a height that may be greater than the thickness of the circuit board 1 a, or may be equal to or less than the thickness of the circuit board 1 a. After that, the pins of the first chip 3 a are conducted to corresponding positions of the circuit board 1 a through leads.

Referring to FIG. 1c , the first chip 3 a is packaged from the side of the circuit board 1 a facing away from the adhesive tape 2 a. For example, the first chip 3 a may be packaged through an injection molding process or a film-on-wire (FOW) process to obtain a first packaging layer 4 a. For those skilled in the field of chip packaging, the injection molding process or the film-on-wire (FOW) process is a conventional technical means, which will not be described in detail herein.

The first packaging layer 4 a packages both the first chip 3 a and its pins on the circuit board 1 a; in the mean time, the first packaging layer 4 a fills a gap between the first chip 3 a and the open slot 10 a, thereby firmly combining the first chip 3 a with the circuit board 1 a together.

Referring to FIG. 1d , a second chip 5 a is mounted on a surface of the first packaging layer 4 a, and pins of the second chip 5 a are conducted to the circuit board 1 a through leads. The second chip 5 a may be bonded to the top surface of the first packaging layer 4 a in a manner well known to those skilled in the art, and the size of the second chip 5 a is larger than those of the first chip 3 a and the open slot 10 a, constituting a typical packaging structure with a large top chip and a small bottom chip. With such a structural design, there is no need to worry about a series of problems resulting from vibration caused by hanging during performing pressure welding on the chip.

Referring to FIG. 1e , the second chip 5 a undergoes a further packaging to obtain a second packaging layer 6 a. The second packaging layer 6 a may be formed by the injection molding process, and package the second chip 5 a and its leads, as well as the first packaging layer 4 a simultaneously on the circuit board 1 a. The second packaging layer 6 a and the first packaging layer 4 a may adopt the same material and process, which will not be described in detail herein.

Referring to FIG. 1f , the adhesive tape 2 a is removed to obtain the packaging structure of the chips. Since the adhesive tape 2 a is bonded to the circuit board 1 a, the first chip 3 a, and the first packaging layer 4 a only by its own weak adhesiveness, the adhesive tape 2 a may be peeled off directly.

For those skilled in the art, a pyrolysis film, a photolysis film, or a baseplate containing a release layer may also be selected as a temporary carrier of the chips. For example, when the pyrolysis film is selected, it may be removed by heating; when the photolysis film is selected, it may be removed by irradiation. When the baseplate containing the release layer is selected as the temporary carrier, it may be removed in different ways according to the type of the release layer. For example, the release layer may be made of pyrolysis material or photolysis material, which will not be described in detail herein.

For those skilled in the art, a cutting step may also be included. The packaging structure obtained above is cut according to design requirements, so as to obtain an separate package.

In addition, the above steps may be applied to a large-scale production line to produce a large number of packages simultaneously, which will not be described in detail herein.

FIG. 2a-2f show a second embodiment of the packaging method of the present disclosure.

Referring to FIG. 2a , a baseplate having an open slot 10 b is provided. The baseplate comprises a circuit board 1 b, and is formed therein with a circuit layout for wiring. The size and shape of the open slot 10 b may be determined according to the type of the chip. The pyrolysis film 2 b is bonded to one side of the circuit board 1 b and covers an opening on one side of the open slot 10 b.

Referring to FIG. 2b , a first chip 3 b is mounted on the pyrolysis film 2 b at the position of the open slot 10 b, and pins of the first chip 3 b faces the pyrolysis film 2 b. The first chip 3 b is located in the open slot 10 b, and is bonded by the adhesive layer of the pyrolysis film 2 b. Wherein, the first chip 3 b is of a height that may be greater than the thickness of the circuit board 1 b, or may be equal to or less than the thickness of the circuit board 1 b.

Referring to FIG. 2c , a second chip 5 b is mounted on the top of the first chip 3 b, may have the same size as that of the first chip 3 b, and is mounted on the top surface of the first chip 3 b in such a way that its pins face away from the pyrolytic film 2 b. After that, the pins of the second chip 5 b are conducted to the corresponding positions on the circuit board 1 b through leads.

The first chip 3 b may be located in the open slot 10 b of the circuit board 1 b, that is, the first chip 3 b has a thickness smaller than that of the circuit board 1 b. In this way, the second chip 5 b may be at least partially located in the open slot 10 b, so that the two chips are stacked in a manner of being embedded in the circuit board 1 b.

Referring to 2 d, the first chip 3 b and the second chip 5 b are packaged from the side of the circuit board 1 b facing away from the pyrolytic film 2 b. For example, the first chip 3 b and the second chip 5 b may be packaged through the injection molding process or the film-on-wire (FOW) process to obtain a first packaging layer 4 b. For those skilled in the field of packaging a chip, the injection molding process or the film-on-wire (FOW) process is a conventional method, which will not be described in detail.

The first packaging layer 4 b packages the first chip 3 b, the second chip 5, as well as the pins of the second chip 5 on the circuit board 1 b simultaneously; at the same time, the first packaging layer 4 b will fill the gap between the chips and the open slot 10 b, therefore firmly bonding the chips with the circuit board 1 b together.

Referring to 2 e, the pyrolysis film 2 b is removed to obtain the packaging structure of the chips. For example, the pyrolysis film 2 b may be easily removed from the circuit board 1 b, the first chip 3 b, and the first packaging layer 4 b by heating.

For those skilled in the art, a photolytic film or a baseplate containing a release layer may be selected as a temporary carrier for the chips, which will not be described in detail herein.

Referring to FIG. 2f , since the pyrolytic film 2 b is removed, the lower surface of the first chip 3 b is exposed. In this way, the pins on the lower surface of the first chip 3 b may be conducted to the corresponding positions on the circuit board 1 b through the leads.

Referring to FIG. 2g , the first chip 3 b and its leads are further packaged from the lower surface of the circuit board 1 b to obtain a second packaging layer 6 b. For example, it can be further packaged by a process of dispensing, injection molding, or film-on-wire. For those skilled in the field of packaging chips, the process of dispensing, injection molding, or film-on-wire (FOW) is a conventional method, which will not be described in detail.

The second packaging layer 6 b packages the lower surface of the first chip 3 b and its leads on the lower surface of the circuit board 1 b simultaneously, therefore firmly combining the chips with the circuit board 1 b together.

After that, a solder ball may be planted at a corresponding position on the lower surface of the circuit board 1 b to facilitate the conduction between the package and an external circuit, which will not be described in detail herein.

Compared with a traditional packaging structure in which chips are stacked, the packaging structure of the present embodiment in which the embedded chips are stacked may greatly reduce the thickness of the package to meet the requirements for ultra-thin package.

FIG. 3a-3g show a third embodiment of the packaging method of the present disclosure.

Referring to FIG. 3a , a baseplate 1 c having an open slot 10 b is provided. The open slot 10 has a size and shape that may be determined according to the type of a chip, and may be provided with a plurality of open slots. FIG. 3a shows a schematic diagram of two open slots 10 c. A pyrolysis film 2 c is bonded to one side of the baseplate 1 c and covers one side of the open slot 10 c.

Referring to FIG. 3b , a chip 3 c is mounted on the pyrolysis film 2 c at the position of the open slot 10 c, and pins of the chip 3 c faces the pyrolysis film 2 c. The chip 3 c is located in the open slot 10 c, and is bonded by the adhesive layer of the pyrolysis film 2 c. Wherein, the chip 3 c may have a height that is greater than the thickness of the baseplate 1 c, or is equal to or less than the thickness of the baseplate 1 c.

Referring to FIG. 3c , the chip 3 c is packaged from the side of the baseplate 1 c facing away from the pyrolytic film 2 c. For example, the chip 3 c may be packaged through the injection molding process or the film-on-wire (FOW) process to obtain a packaging layer 4 c. For those skilled in the field of packaging a chip, the injection molding process or the film-on-wire (FOW) process is a conventional method, which will not be described in detail.

The packaging layer 4 c packages the chip 3 c on the baseplate 1 c; at the same time, the packaging layer 4 c will fill the gap between the chip 3 c and the open slot 1 c, thereby firmly combining the chip 3 c and the baseplate 1 c together.

Referring to FIG. 3d , preferably, the outer surface of the packaging layer 4 c may be thinned. For example, it can be thinned by grinding, and the thickness to be thinned may be determined according to actual needs. For example, the thickness of the chip 3 c may be designed to be lower than or equal to the thickness of the baseplate 1 c. In this way, the packaging layer 4 c may be thinned to expose the surface of the baseplate 1 c.

Referring to FIG. 3e , the pyrolysis film 2 c is removed to obtain the packaging structure for a chip. For example, the pyrolysis film 2 c may be easily removed from the baseplate 1 c, the chip 3 c, and the packaging layer 4 c by heating.

For those skilled in the art, a photolytic film or a baseplate containing a release layer may be selected as a temporary carrier for the chips, which will not be described in detail herein.

Referring to FIG. 3f , since the pyrolytic film 2 b is removed, the lower surface of the chip 3 c is exposed. A circuit may be routed on the baseplate 1 c through a re-distribution procedure (RDL process) and be led out. For example, a conductive circuit 7 c and a trace layer may be made on the baseplate 1 c; finally, a solder ball 8 c may be planted on the baseplate 1 c and the chip 3 c to facilitate the conduction between the package and an external circuit. The process of re-distribution on the baseplate is the common knowledge of those skilled in the art, which will not be described in detail herein.

Referring to FIG. 3g , the baseplate 1 c is cut along corresponding positions, so that a plurality of separate chip packages may be obtained.

The packaging process of this embodiment is a panel-level fan-out packaging, in which the chips are packaged in the open slot of the baseplate, so that the warpage of the package may be controlled; and the chips are placed by the bonding process, and thus have a high positioning accuracy; a PCB process can be used for the re-distributing manufacture procedure, leading to a high matching of equipment and materials and reduced processing costs.

While certain specific embodiments of the present disclosure have been illustrated by way of example, it will be understood by those skilled in the art that the foregoing examples are provided for the purpose of illustration and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified without departing from the scope and spirit of the disclosure. The scope of the present disclosure is subject to the attached claims. 

1. A method for packaging a chip, comprising: providing a baseplate formed with an open slot thereon penetrating through opposite sides of the baseplate; providing a release base material, wherein the release base material is bonded to a first side of the baseplate and covers the open slot; providing a first chip, wherein the first chip is mounted on the release base material at the position of the open slot; packaging a second side of the baseplate facing away from the release base material so as to form a packaging layer which packages the first chip to be fixed on the baseplate; removing the release base material to obtain a package structure for the first chip.
 2. The method of claim 1 for packaging a chip, wherein a top surface of the first chip is flush with or lower than a top surface of the baseplate; and the method further comprises, after the packaging the second side of the baseplate, thinning the packaging layer.
 3. The method of claim 1 for packaging a chip, wherein the providing the first chip further comprises mounting the first chip on the release base material in a manner in which pins thereon face the release base material; and the method further comprises, after the removing the release base material performing re-distribution on the baseplate.
 4. The method of claim 3 for packaging a chip, further comprising, after the performing re-distribution, performing cutting to obtain a plurality of separate packaging structures.
 5. The method of claim 1 for packaging a chip, wherein the providing the first chip further comprises conducting the first chip to the baseplate through leads; and wherein the packaging the second side of the baseplate further comprises packaging the first chip and its leads and fixing both on the baseplate; and further comprising mounting a second chip on the packaging layer and conducting the second chip to the baseplate through leads; and packaging the second chip, to form another packaging layer for packaging the second chip on the baseplate.
 6. The method of claim 1 for packaging a chip, wherein the providing the first chip further comprises mounting, the first chip on the release base material in a manner in which pins thereon face the release base material, mounting the second chip on the first chip in a manner in which pins thereon face away from the release base material, wherein the pins of the second chip are conducted to the baseplate through leads; wherein the packaging the second side of the baseplate further comprises packaging the first chip, the second chip and the leads of the second chip and fixing all on the baseplate; and the method further comprises after the removing the release base material, conducting the pins of the first chip to the baseplate through leads, and packaging the first chip and its pins from the second side of the baseplate.
 7. The method of claim 6 for packaging a chip, further comprising a further packaging of the first chip and its leads from the second side of the baseplate through a dispensing process.
 8. The method of claim 6 for packaging a chip, the first chip having a size, wherein the second chip has the size.
 9. The method of claim 1 for packaging a chip, wherein the packaging the second side of the baseplate is selected from the group consisting of an injection molding process and a film-on-wire process.
 10. The method of claim 1 for packaging a chip, wherein the release base material is selected from the group consisting of an adhesive tape, a pyrolysis film, a photolysis film, and a baseplate containing a release layer. 